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Grind it down?

Agreed, this should be something you check on the regular. While your at it check the front diff, t-case, and trans. Same method, same fluid. If you are unsure of what's in there now or have never changed the fluids, I'd drain them completely and refill.

There should be a fill plug on the back. Pull it and put in gear oil until it starts spilling out. I'd just run some cheap 80-90w until you get it fixed. Don't let it run dry!!! I'd say pinion seal also but I don't see much wetness around there. It could be the 3rd member seal, the rear cover...